Centrifugal fan impeller structure

ABSTRACT

A centrifugal fan impeller structure includes a hub and a second annular body. The hub has an extension section. A first annular body is connected to a free end of the extension section. The first annular body has a first side and a second side. A first blade set is disposed on the first side. The second annular body has a third side and a fourth side. A second blade set is disposed on the third side. The fourth side is mated and connected with the second side. The centrifugal fan impeller structure is able to greatly increase air volume and wind pressure of the fan. Moreover, in operation, the centrifugal fan impeller structure makes less noise.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a centrifugal fan impellerstructure, and more particularly to a centrifugal fan impeller structurewith double layers of blades for enhancing flow guide effect andincreasing wind pressure of the fan. Moreover, in operation, thecentrifugal fan impeller structure makes less noise.

2. Description of the Related Art

Following the rapid development of electronic industries, theperformances of electronic components have been continuously enhanced.When operating at high speed, the electronic components generate highheat. It is necessary to efficiently dissipate the heat. Otherwise, thetemperature will rise very quickly to deteriorate the performances ofthe electronic components or even cause burnout of the electroniccomponents. In general, a miniaturized centrifugal fan is mounted in alimited space of the system for dissipating the heat generated by theelectronic components. The centrifugal fan mainly includes a frame body,a fan hub and multiple fan blades annularly arranged along outercircumference of the fan hub. The frame body has two wind inlets onupper and lower sides and a wind outlet on a lateral side. In operation,the fan blades rotate to drive and flow the ambient air. The axialairflow coming in from the wind inlet will turn to radial airflow, whichis exhausted from the wind outlet of the frame body.

At current stage, some manufacturers try to change the configuration ofthe fan blades for achieving greater wind pressure and air volume.However, only limited effect is achieved by such change so that therequirements of users are still unfulfilled. This is because the framebody is quite narrow and it is hard to vary the configuration orstructural design of the fan blades in such a narrow space. Therefore,the conventional centrifugal fan has the following shortcomings:

1. The structural design is limited.

2. It is hard to increase the wind pressure.

3. The flow guide effect is poor.

SUMMARY OF THE INVENTION

A primary object of the present invention is to provide a centrifugalfan impeller structure, which is able to two-way increase air volume andwind pressure of the fan.

A further object of the present invention is to provide the abovecentrifugal fan impeller structure, which can be selectively assembledin different forms to change the angle of the blades.

To achieve the above and other objects, the centrifugal fan impellerstructure of the present invention includes a hub and a second annularbody.

The hub has an extension section. A first annular body is connected to afree end of the extension section. The first annular body has a firstside and a second side. A first blade set is disposed on the first side.The first blade set includes multiple first blade bodies.

The second annular body has a third side and a fourth side. A secondblade set is disposed on the third side. The second blade set includesmultiple second blade bodies. The fourth side is mated and connectedwith the second side.

The centrifugal fan impeller structure is able to two-way increase airvolume and wind pressure of the fan to enhance flow guide effect of thefan as a whole. Moreover, in operation, the centrifugal fan impellerstructure makes less noise. Accordingly, the present invention has thefollowing advantages:

1. The present invention has better flow guide effect.

2. The present invention is able to increase wind pressure.

3. In operation, the present invention makes less noise.

4. The relative inclination of the first and second blade sets iscustomizedly adjustable.

BRIEF DESCRIPTION OF THE DRAWINGS

The structure and the technical means adopted by the present inventionto achieve the above and other objects can be best understood byreferring to the following detailed description of the preferredembodiments and the accompanying drawings, wherein:

FIG. 1 is a perspective exploded view of a first embodiment of thecentrifugal fan impeller structure of the present invention;

FIG. 2 is a perspective assembled view of the first embodiment of thecentrifugal fan impeller structure of the present invention;

FIG. 3 is a top view of a second embodiment of the centrifugal fanimpeller structure of the present invention;

FIG. 4 is a top view of a third embodiment of the centrifugal fanimpeller structure of the present invention;

FIG. 5 is a side view of a fourth embodiment of the centrifugal fanimpeller structure of the present invention;

FIG. 6 is a side view of a fifth embodiment of the centrifugal fanimpeller structure of the present invention;

FIG. 7 is a top view of a sixth embodiment of the centrifugal fanimpeller structure of the present invention;

FIG. 8 is a top view of a seventh embodiment of the centrifugal fanimpeller structure of the present invention; and

FIG. 9 is a perspective exploded view of an eighth embodiment of thecentrifugal fan impeller structure of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to FIGS. 1 and 2. FIG. 1 is a perspective exploded view ofa first embodiment of the centrifugal fan impeller structure of thepresent invention. FIG. 2 is a perspective assembled view of the firstembodiment of the centrifugal fan impeller structure of the presentinvention. According to the first embodiment, the centrifugal fanimpeller structure 1 of the present invention includes a hub 11 and asecond annular body 12.

The hub 11 has an extension section 111. A first annular body 112 isconnected to a free end of the extension section 111. The first annularbody 112 has a first side 1121 and a second side 1122. A first blade set13 is disposed on the first side 1121. The first blade set 13 includesmultiple first blade bodies 131.

The second annular body 12 has a third side 121 and a fourth side 122. Asecond blade set 14 is disposed on the third side 121. The second bladeset 14 includes multiple second blade bodies 141. The fourth side 122 ismated and connected with the second side 1122.

Each first blade body 131 has a first end 1311 and a second end 1312.Each second blade body 141 has a third end 1411 and a fourth end 1412.Each two adjacent first blade bodies 131 define therebetween a firstflow way 1313. Each two adjacent second blade bodies 141 definetherebetween a second flow way 1413. The number of the first bladebodies 131 is equal to the number of the second blade bodies 141.

Please now refer to FIG. 3, which is a top view of a second embodimentof the centrifugal fan impeller structure of the present invention. Thesecond embodiment is substantially identical to the first embodiment instructure and thus will not be repeatedly described hereinafter. Alsoreferring to FIG. 1, the second embodiment is different from the firstembodiment in that the first blade set 13 extends away from the firstannular body 112 by a first length and the second blade set 14 extendsaway from the second annular body 12 by a second length. The firstlength is shorter than the second length.

Please now refer to FIG. 4, which is a top view of a third embodiment ofthe centrifugal fan impeller structure of the present invention. Thethird embodiment is substantially identical to the first embodiment instructure and thus will not be repeatedly described hereinafter. Thethird embodiment is different from the first embodiment in that thenumber of the first blade bodies 131 is unequal to the number of thesecond blade bodies 141. In this embodiment, the number of the firstblade bodies 131 is, but not limited to, smaller than the number of thesecond blade bodies 141 for illustration purposes only.

Please now refer to FIG. 5, which is a side view of a fourth embodimentof the centrifugal fan impeller structure of the present invention. Thefourth embodiment is substantially identical to the first embodiment instructure and thus will not be repeatedly described hereinafter. Thefourth embodiment is different from the first embodiment in that theheight of the second end 1312 of the first blade body 131 is larger thanthe height of the fourth end 1412 of the second blade body 141.

Please now refer to FIG. 6, which is a side view of a fifth embodimentof the centrifugal fan impeller structure of the present invention. Thefifth embodiment is substantially identical to the first embodiment instructure and thus will not be repeatedly described hereinafter. Thefifth embodiment is different from the first embodiment in that theheight of the fourth end 1412 of the second blade body 141 is largerthan the height of the second end 1312 of the first blade body 131.

Please now refer to FIG. 7, which is a top view of a sixth embodiment ofthe centrifugal fan impeller structure of the present invention. Thesixth embodiment is substantially identical to the first embodiment instructure and thus will not be repeatedly described hereinafter. Thesixth embodiment is different from the first embodiment in that thefirst end 1311 of the first blade body 131 is misaligned with the thirdend 1411 of the second blade body 141. Each two adjacent first bladebodies 131 define therebetween a first flow way 1313. Each two adjacentsecond blade bodies 141 define therebetween a second flow way 1413. Thefirst flow way 1313 has a first wind inlet end 1313 a and a first windoutlet end 1313 b. The second flow way 1413 has a second wind inlet end1413 a and a second wind outlet end 1413 b. The first wind inlet end1313 a is misaligned with the second wind inlet end 1413 a.

Please now refer to FIG. 8, which is a top view of a seventh embodimentof the centrifugal fan impeller structure of the present invention. Theseventh embodiment is substantially identical to the first embodiment instructure and thus will not be repeatedly described hereinafter. Theseventh embodiment is different from the first embodiment in that thefirst end 1311 of the first blade body 131 is aligned with the third end1411 of the second blade body 141. The first flow way 1313 has a firstwind inlet end 1313 a and a first wind outlet end 1313 b. The secondflow way 1413 has a second wind inlet end 1413 a and a second windoutlet end 1413 b. The first wind inlet end 1313 a is aligned with thesecond wind inlet end 1413 a.

Please now refer to FIG. 9, which is a perspective exploded view of aneighth embodiment of the centrifugal fan impeller structure of thepresent invention. The eighth embodiment is substantially identical tothe first embodiment in structure and thus will not be repeatedlydescribed hereinafter. Also referring to FIGS. 1, 7 and 8, the eighthembodiment is different from the first embodiment in that the secondside 1121 of the first annular body 112 has a reception section 1123.The reception section 1123 includes a first reception socket set 1123 aand a second reception socket set 1123 b. The fourth side 122 of thesecond annular body 12 has multiple boss bodies 1221. The boss bodies1221 can be selectively correspondingly inserted into the firstreception socket set 1123 a or the second reception socket set 1123 b.

By means of the reception section 1123 and the boss bodies 1221, thesecond annular body 12 can be quickly disassembled from and reassembledwith the first annular body 112. Accordingly, the position of the firstend 1311 of the first blade body 131 can be quickly changed to align thefirst end 1311 of the first blade body 131 with the third end 1411 ofthe second blade body 141 (as shown in FIG. 8) or misalign the first end1311 of the first blade body 131 with the third end 1411 of the secondblade body 141 (as shown in FIG. 7).

The above embodiments are only used to illustrate the present invention,not intended to limit the scope thereof. It is understood that manychanges and modifications of the above embodiments can be made withoutdeparting from the spirit of the present invention. The scope of thepresent invention is limited only by the appended claims.

What is claimed is:
 1. A centrifugal fan impeller structure comprising: a hub having an extension section, a first annular body being connected to a free end of the extension section, the first annular body having a first side and a second side, a first blade set being disposed on the first side, the first blade set including multiple first blade bodies; a second annular body having a third side and a fourth side, a second blade set being disposed on the third side, the second blade set including multiple second blade bodies, the fourth side being mated and connected with the second side.
 2. The centrifugal fan impeller structure as claimed in claim 1, wherein each first blade body has a first end and a second end and each second blade body has a third end and a fourth end, each two adjacent first blade bodies defining therebetween a first flow way, each two adjacent second blade bodies defining therebetween a second flow way.
 3. The centrifugal fan impeller structure as claimed in claim 1, wherein the first blade set extends away from the first annular body by a first length and the second blade set extends away from the second annular body by a second length, the first length being shorter than the second length.
 4. The centrifugal fan impeller structure as claimed in claim 1, wherein the number of the first blade bodies is equal to the number of the second blade bodies.
 5. The centrifugal fan impeller structure as claimed in claim 2, wherein the height of the second end of the first blade body is larger than the height of the fourth end of the second blade body.
 6. The centrifugal fan impeller structure as claimed in claim 2, wherein the height of the fourth end of the second blade body is larger than the height of the second end of the first blade body.
 7. The centrifugal fan impeller structure as claimed in claim 1, wherein each first blade body has a first end and a second end and each second blade body has a third end and a fourth end, the first end of the first blade body being misaligned with the third end of the second blade body, each two adjacent first blade bodies defining therebetween a first flow way, each two adjacent second blade bodies defining therebetween a second flow way, the first flow way having a first wind inlet end and a first wind outlet end, the second flow way having a second wind inlet end and a second wind outlet end, the first wind inlet end being misaligned with the second wind inlet end.
 8. The centrifugal fan impeller structure as claimed in claim 1, wherein each first blade body has a first end and a second end and each second blade body has a third end and a fourth end, the first end of the first blade body being aligned with the third end of the second blade body, the first flow way having a first wind inlet end and a first wind outlet end, the second flow way having a second wind inlet end and a second wind outlet end, the first wind inlet end being aligned with the second wind inlet end.
 9. The centrifugal fan impeller structure as claimed in claim 1, wherein the second side of the first annular body has a reception section, the reception section including a first reception socket set and a second reception socket set, the fourth side of the second annular body having multiple boss bodies, whereby the boss bodies can be selectively correspondingly inserted into the first reception socket set or the second reception socket set.
 10. The centrifugal fan impeller structure as claimed in claim 1, wherein the number of the first blade bodies is unequal to the number of the second blade bodies. 